Shadowsocks-libev: Server can't start automatically when using an ipv6 address

[changhexiong]

What version of shadowsocks-libev are you using?

3.0.8, from repository.

What operating system are you using?

Ubuntu 17.10 (GNU/Linux 4.13.0-25-generic x86_64)

What did you do?

Used an ipv6 address in config.json
systemctl enable shadowsocks-libev.service

What did you expect to see?

ss-server start when system boot up

What did you see instead?

shadowsocks-libev.service failed with error code 255 when system boot up
ERROR: bind: Cannot assign requested address
ERROR: bind() error
shadowsocks-libev.service: Main process exited, code=exited, status=255/n/a
shadowsocks-libev.service: Unit entered failed state.
shadowsocks-libev.service: Failed with result 'exit-code'.

But when I restart it (systemctl restart shadowsocks-libev.service), no error occured.

What is your config in detail (with all sensitive info masked)?

{
"server":"0:0:0:0:0:0:0:0",
"server_port":8000,
"local_port":1080,
"password":"password",
"timeout":60,
"method":"aes-256-cfb"
}

[whour]

"server":["0.0.0.0","::0"]